Range apparatus



H. E. COSS IN RANGE APPARATUS I Filed July 29, 1942 3 Sheets-Sheet 1 m a mm W v E w M 5 rv P M a xfi y a 4 a. 2 2 a E; Q r a 7 w z w Q 3 L w H. E. COSSIN RANGE APPARATUS Filed July 29, 1942 I 3 Sheets-Sheet 2 I I I I I I I I I I 0 l i I l I I i I.

Sept. 4, 1945.

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Patented Sept. 4, 1945 RANGE APPARATUS Hursle E. Cossln, Detroit, Mich., assignor to Nash- Kelvinator Corporation, Detroit, Mich., a corporation of Maryland Application July 29, 1942, Serial No. 452,744

1 Claim.

The present invention pertains -to an electric range, and more particularly to construction of a cooking well used therein.

It is an object of the present invention to provide a. well having insulated walls in which is suspended a cooking vessel and having an arrangement for controlling a heating element positioned in the Well so as to maintain uniform a selected cooking temperature during the entire cooking process.

It is another object of the present invention to provide a pressure responsive device for controlling a heating element positioned in a cooking well, which is responsive to the temperature of the heated air circulating about the cooking vessel set within said well..

The invention itself, however, both as to its organization and its method of operation, together with additional objects and advantages thereof, will best be understood from the followformed in two sections, an upper portion 56 and mg description when read in conjunction with the accompanying drawings, in which! Fig. 1 is a front elevational view of a range embodying features of the present invention;

Fig. 2 is a view taken along line 2-2 of Fig. 1;

Fig. 3 is an enlarged view taken along line 3-3 of Fig. 2;

Fig. 4 is a cross sectional view with parts broken away along line 4-4 of Fig. 2;

Fig. 5 is a fragmentary top 'plan view of the invention with parts broken away and parts shown in section;

Fig. 6 is a fragmentary enlarged cross sectional view taken along line 8- 6 of Fig. 4;

Fig. 7' is a fragmentary enlarged cross sectional view taken along line I--| of Fig. 5:

Fig. 8 is av fragmentary enlarged cross sectional view taken along line 8-8 of Fig. 5;

Fig. 9 is a fragmentary enlarged crom sectional view taken along line 9-8 of Fig. 2:

Fig. 10 is an enlarged cross sectional view taken along line l0-ll of Fig. 2;

Fig. 11 is a cross sectional view taken along line ll-Il of Fig. 9: and i Fig. 12 is a diagrammatic view or the wirin diagram used in the present invention.

Shown in the drawings is an electric range 2| comprising a shell or casing 22 supported on base 24, and a table top "supported upon and secured to the casing II. The table top has an upwardly extended back portion 21.

Formed in the table top 22. are openings OI each having its marginal r'iminsetted to form a ledge 32 for support of surface heating element or unit 34. Each unit is connected in an eleca lower portion 51 whose ends telescope at about midway in the well and are secured'together by weld, or the like. The upper portion It is formed with the rim it against which abuts one end of the outer shell 49. Lugs 59 are secured by weld at spatial intervals to the lower portion ll of the inner shell adjacent its bottom edge. The bottom wall it is attached by screws to the lugs 59 and serves as a cap for the inner and outer shells.

The vessel 45 is secured to the table top by means of an L-shaped bracket ll attached to the outer shell 48 and having one leg "enga e the underside of ledge 42 to prevent lifting or removal of the vessel through opening 40. To hold the vessel stationary and prevent notation an upwardly extending arm 63 is secured by weld to the outer shell having its free end engageable in a recess ll formed in the ledge 42.

Set within the wall 48 is a container or kettle It having a rim 1 adapted to rest upon the rim 44 for dependingly supporting the kettle within the well. The kettle is provided with a suitable cover or lid 8!. Handles II are pivotally mounted to the kettle to assist in lifting the kettle out, or inserting the kettle into the well N.

The kettle is slightly spaced from the sides of the well to permit air circulation. The air is heated by electrical coils I! wound and set in grooves formed in the insulation disk It secured by bolt and nut II to the bottom wall 54. The ends of coils I! are bindingly secured to terminal post which are connected by conductor strips II to terminal block 1!. A shield plate 00 is securedtothebottomwali tocxtendoversnd protect the conductor strips and terminal post.

Awirefl connectsonesideoftbecoihllto one side of a thermostatical switch ll. The otherendotthecoilsllareconnectedbywire ti and with wire .0, connecting the other of the thermoststical switch N, to a suitable source 01' electrical energy.

The. thermostatical switch is provided with a tube I having its end secured in a recess I02 formed in the inner shell 50. The recess extends circumferentially about the well I6, and is formed by depressing the lower shell at a point where it telescopes with the upper shell 56. The shell 56 extends slightly over the recess so as to form a pocket or trap for the ai circulating upwardly from the heating coils to contact the tube. The tube extends preferably about one-half the distance about the circumference of the well and is secured by tabs I04 which are punched from the shell 51. Openings I05 is formed in the outer shell. to permit insertion of a tool for pressing the tabs 04 under the tube.

The thermostatical switch 94 is secured to a panel IIB aflixed to the casing 22. A shaft II2 extends from the switch through the panel III! and having affixed thereon an adapter extension ii 3 which projects through front panel 31. Fixedly secured on the adaptor extension is a knob I IS. A rotation of the knob I I6 rotates the shaft to effect variation in the pressure differential required to operate the switch mechanism within the casing 94. The thermostatical switch is not shown in detail in that it may be of any of the types known to the art. Stops are provided for the switch comprising a screw I I9 carried by the adaptor IIZ adapted to abut the turned edge I 01 the spring arm I22 when the switch is fully opened, and abut the arm I24 when the switch is fully closed. A notch I formed in the adaptor is engaged by arm I22 to hold the switch in open position. The arms I22 and I24 are bent from plate I26 which is secured to the panel IIfl.

A signal light I34 is secured above the thermostatical switch 94 connected across th line from wire 92 to wire 95 to indicate when the current is flowing to the coils TI. The signal light is viewed through opening I35 in panel 31.

The tube III is filled with suitable liquid or gases which is sensitive to the variation in temperature of the circulating air in the cooking well to eflect a corresponding change in its pressure to operate the switch mechanism in casing 94 to either close or open the electrical circuit dependent upon a rise or fall of the air temperature from the predetermined selected temperature. Graduations are marked on the panel 31 to determine the degree of rotation of the knob IIIi fora setting to a desired temperature.

By placing the tube I 00 in direct contact with the heated air circulating about the cooking vessel or kettle there is maintained a more uniform cooking temperature. The capillary tube is instantaneously responsive to the air temperature to efiect immediate operation of the switch mechanism upon a slight variation of air temperature.

Shielding the tube I00 within the recess by the overhanging of the wall 86 the kettle may be readily removed from or inserted into the well without fear of injury to the capillary tube.

While I have shown and described the preferred form of my invention, I do not wish to limit myself to the precise details as shown, but wish to availmyself of such variations and modiflcations as may come within the scope of the appended claim.

I claim:

In a cooking well having spaced inner and outer side walls and a bottom wall, heat insulation between said Spaced side walls, said inner side wall having upper and lower sections in telescoping arrangement, the lower section having a depressed portion forming with the telescoping upper section a pocket, said pocket being in open communication with the well and a control element positioned in said pocket.

HURSLE E. COSBIN. 

